Washington Comprehensive Assessment of Science (WCAS) Grade 8 study plan

Washington Comprehensive Assessment of Science (WCAS) Grade 8 · Give each week a clear focus.

8 weeks · About 6 hours per week

Week 1

Physical Science

Define and distinguish speed, velocity, and acceleration using everyday examples
Interpret distance-time and speed-time graphs to describe motion
Calculate net force on an object using balanced and unbalanced force scenarios
Explain how Newton's three laws apply to common situations such as seatbelts and pushing a cart

A one-page motion-and-forces summary sheet with 5 worked calculation examples and 3 labeled graphs, self-graded against a checklist

Week 2

Compare kinetic and potential energy and trace energy transformations in a system
Apply the idea of conservation of energy to explain why objects slow down or heat up
Model heat transfer by conduction, convection, and radiation with a labeled diagram
Predict how adding or removing thermal energy changes particle motion and states of matter

A completed energy-transformation storyboard showing at least 4 real-world systems with energy inputs, outputs, and losses identified

Week 3

Describe the relationship between wave amplitude, wavelength, frequency, and energy
Differentiate mechanical and electromagnetic waves and give examples of each
Explain how light interacts with materials through reflection, refraction, and absorption
Relate wave behavior to real devices such as mirrors, lenses, and sound insulation

A wave-properties quiz (10 self-written questions with answer key) scored at 80% or higher on a second attempt

Week 4

Identify the structures and functions of major cell organelles in plant and animal cells
Compare and contrast cell division processes and their purposes in growth and reproduction
Explain how body systems interact to maintain homeostasis
Trace how oxygen and nutrients reach cells through multiple body systems

A labeled cell diagram plus a written explanation of how at least 3 body systems cooperate, checked against a rubric of 5 required elements

Week 5

Model how DNA and genes determine traits and how traits pass to offspring
Distinguish inherited traits from acquired traits with examples
Predict offspring trait ratios using simple genetic crosses
Explain how environmental factors and mutations influence gene expression and variation

A completed genetics problem set of 8 Punnett-square crosses with written ratio predictions, scored at 75% or higher

Week 6

Diagram energy flow through producers, consumers, and decomposers in a food web
Explain how matter cycles through ecosystems via carbon and nitrogen pathways
Analyze how population changes and resource limits affect ecosystem stability
Evaluate how human activity alters ecosystems and propose evidence-based solutions

A food-web diagram for a chosen ecosystem with a written paragraph predicting the effects of removing one species, reviewed against a 4-point rubric

Week 7

Describe Earth's layers and explain how plate tectonics drives earthquakes, volcanoes, and mountain building
Interpret rock and fossil evidence to construct a relative geologic timeline
Explain how weathering, erosion, and deposition reshape landforms
Relate the water cycle and ocean circulation to patterns of weather and climate

A geologic timeline and landform-change diagram with 6 labeled events and a short written justification for each ordering choice

Week 8

Synthesize cross-domain connections such as energy flow in ecosystems and Earth's energy budget
Complete a timed full-length practice set under test conditions and record missed-item patterns
Re-teach the three weakest concepts in writing without notes
Build a final one-page reference sheet covering the highest-frequency formulas and vocabulary

A full practice test scored and analyzed, with a written remediation log for every missed item and a final reference sheet

Week 2: Score 80% or higher on a self-made physical science calculation and concept quiz covering motion, forces, and energy

Week 4: Explain aloud, without notes, how at least 3 body systems work together, verified against a 5-element checklist

Week 6: Complete 10 genetics and ecology questions in 20 minutes with at least 75% accuracy

Week 8: Achieve 80% or higher on the full-length timed practice test and submit a completed remediation log for all missed items